First page of Bach's Nekrolog, p. 158 in Mizler's Musikalische Bibliothek, Volume IV Part 1 (1754). In English the full title reads: "(Chapter) VI: Memorial of three deceased members of the Society of Musical Sciences; (section) C: The third and last is the one in organ-playing World-famous Highly-esteemed Mr. Johann Sebastian Bach, Royal-Polish and Prince-electoral Saxonian court composer, and music director in Leipzig."
The 1754 obituary of Johann Sebastian Bach is usually called the Nekrolog. It was published four years after his death.